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Mining Engineering Opencast Mining Difficulty: Medium

Hydraulic wagon drill can drill holes of diameter ranges from . . . . . . . .

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The method of stoping is applied for massive deposits of large horizontal extent. For deep shafts where high outputs is desirable, best suited winding is . . . . . . . . The method of stoping selected if the ore is very weak, moderately dipping with very weak host rock. In smoke generator for measuring air velocity the time taken by the smoke to travel . . . . . . . . m recorded. Water bearance of Indian coal seam is